Portion of a watch



FIG. 1 is a perspective view of a portion of a watch showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line showing of the buttons and the remainder of the watch is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a watch, as shown and described. 